Need to add a column with a default value

Similar Questions

• Documentation about adding column with the DEFAULT value.

  Hello
  
  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14200/statements_3001.htm#i2198241
  
  < quote >
  If you add a column, then the initial value of each row in the new column is NULL unless you specify the DEFAULT clause. In this case, Oracle database updates each row in the new column with the value specified for the DEFAULT value. This update operation, in turn, triggers AFTER UPDATE triggers defined on the table.
  < quote >
  
  I am not able to understand the emphasis on the part AFTER UPDATE while the column with DEFAULT values addition triggers both BEFORE and AFTER triggers defined on UPDATE.
  
  According to the documents of 11 g
  
  http://download.Oracle.com/docs/CD/B28359_01/server.111/b28286/statements_3001.htm#i2133105
  
  n.m. (u) r only changes with the NON NULL columns, but focus on AFTER UPDATE is still there. No trigger defined on the fire of the update in this case.
  
  This insistence is intended? If not, IMO, it should be changed.
  
  Kind regards

  Hi Sissi. After further discussion, we have added some information about a change in behavior. Here is what says the next version of the doc:

  When you add a column, the initial value of each row in the new column is null.

  * If you specify the DEFAULT clause for a column NOT NULL, then the default value is stored as metadata, but the column itself is not populated with data. However, the following queries that specify the new column are rewritten so that the default value is returned in the result set.

  This optimized behavior differs from earlier versions, when as part of operation ALTER TABLE Oracle database updated every line in the newly created with the default column and then fired defined update triggers on the table. In this release, no trigger is triggered because the default value is stored only in the form of metadata.

  * If you specify the DEFAULT for a nullable column clause, then the default value is added to existing lines under this ALTER TABLE statement, and any update triggers defined on the table are activated. This behavior also means if you change a NOT NULL column with a default value to be nullable.

  Hope that helps to clarify the matter further.

  Kind regards
  Diana

• I have a column with two values, separated by a space, in each line. How to create 2 new columns with the first value in a column, and the second value in another column?

  I have a column with two values, separated by a space, in each line. How do I create 2 new columns with the first value in one column and the second value in another column?

  Add two new columns after than the original with space separated values column.

  

  Select cell B1 and type (or copy and paste it here) the formula:

  = IF (Len (a1) > 0, LEFT (A1, FIND ("", A1) −1), ' ')

  shortcut for this is:

  B1 = if (Len (a1) > 0, LEFT (A1, FIND ("", A1) −1), ' ')

  C1 = if (Len (a1) > 0, Member SUBSTITUTE (A1, B1 & "", ""), "")

  or

  the formula of the C1 could also be:

  = IF (Len (a1) > 0, RIGHT (A1, LEN (A1) −FIND ("", A1)), "")

  Select cells B1 and C1, copy

  Select cells B1 at the end of the C column, paste

• Mr President, how can I enter two rows at the same time with different default values that only the first line to use see?

  Mr President.

  My worm jdev is 12.2.1

  How to enter two rows at the same time with different default values that only the first line to use see?

  Suppose I have a table with four fields as below

  "DEBIT" VARCHAR2(7) , 
    "DRNAME" VARCHAR2(50),
    "CREDIT" VARCHAR2(7) , 
    "CRNAME" VARCHAR2(50),
  

  Now I want that when I click on a button (create an insert) to create the first line with the default values below

  

  So if I click on the button and then validate the second row with different values is also inserted on commit.

  The value of the second row are like the picture below

  

  But the second row should be invisible. It could be achieved by adding vc in the vo.

  The difficult part in my question is therefore, to add the second row with the new default values.

  Because I already added default values in the first row.

  Now how to add second time default values.

  Concerning

  Mr President

  I change the code given by expensive Sameh Nassar and get my results.

  Thanks once again dear Sameh Nassar .

  My code to get my goal is

  First line of code is

      protected void doDML(int operation, TransactionEvent e) {    
  
          if(operation != DML_DELETE)
               {
                   setAmount(getPurqty().multiply(getUnitpurprice()));
               } 
  
          if (operation == DML_INSERT )
                     {
                             System.out.println("I am in Insert with vid= " + getVid());
                         insertSecondRowInDatabase(getVid(),getLineitem(),"6010010","SALES TAX PAYABLE",
                          (getPurqty().multiply(getUnitpurprice()).multiply(getStaxrate())).divide(100));      
  
                         }
  
          if(operation == DML_UPDATE)
                            {                                                    
  
                               System.out.println("I am in Update with vid= " + getVid());
                           updateSecondRowInDatabase(getVid(),
                               (getPurqty().multiply(getUnitpurprice()).multiply(getStaxrate())).divide(100));      
  
                            }                      
  
          super.doDML(operation, e);
      }
      private void insertSecondRowInDatabase(Object value1, Object value2, Object value3, Object value4, Object value5)
                {
                  PreparedStatement stat = null;
                  try
                  {
                    String sql = "Insert into vdet (VID,LINEITEM,DEBIT,DRNAME,AMOUNT) values " +
               "('" + value1 + "','" + value2 + "','" + value3 + "','" + value4 + "','" + value5 + "')";  
  
                    stat = getDBTransaction().createPreparedStatement(sql, 1);
                    stat.executeUpdate();
                  }
                  catch (Exception e)
                  {
                    e.printStackTrace();
                  }
                  finally
                  {
                    try
                    {
                      stat.close();
                    }
                    catch (Exception e)
                    {
                      e.printStackTrace();
                    }
                  }
                }  
  
                private void updateSecondRowInDatabase(Object value1, Object value5)
                {
                  PreparedStatement stat = null;
                  try
                  {
                    String sql = "update vdet set  AMOUNT='"+ value5+"' where VID='" + value1 + "'";                     
  
                    stat = getDBTransaction().createPreparedStatement(sql, 1);  
  
                    stat.executeUpdate();
                  }
                  catch (Exception e)
                  {
                    e.printStackTrace();
                  }
                  finally
                  {
                    try
                    {
                      stat.close();
                    }
                    catch (Exception e)
                    {
                      e.printStackTrace();
                    }
                  }                  
  
                }
  

  Second line code is inside a bean method

      public void addNewPurchaseVoucher(ActionEvent actionEvent) {
          // Add event code here...
  
          BindingContainer bindings = BindingContext.getCurrent().getCurrentBindingsEntry();
                 DCIteratorBinding dciter = (DCIteratorBinding) bindings.get("VoucherView1Iterator");
                 RowSetIterator rsi = dciter.getRowSetIterator();
                 Row lastRow = rsi.last();
                 int lastRowIndex = rsi.getRangeIndexOf(lastRow);
                 Row newRow = rsi.createRow();
                 newRow.setNewRowState(Row.STATUS_NEW);
                 rsi.insertRowAtRangeIndex(lastRowIndex +1, newRow);
                 rsi.setCurrentRow(newRow);
  
                 BindingContainer bindings1 = BindingContext.getCurrent().getCurrentBindingsEntry();
                 DCIteratorBinding dciter1 = (DCIteratorBinding) bindings1.get("VdetView1Iterator");
                 RowSetIterator rsi1 = dciter1.getRowSetIterator();
                 Row lastRow1 = rsi1.last();
                 int lastRowIndex1 = rsi1.getRangeIndexOf(lastRow1);
                 Row newRow1 = rsi1.createRow();
                 newRow1.setNewRowState(Row.STATUS_NEW);
                 rsi1.insertRowAtRangeIndex(lastRowIndex1 +1, newRow1);
                 rsi1.setCurrentRow(newRow1);
      }
  

  And final saveUpdate method is

      public void saveUpdateButton(ActionEvent actionEvent) {
          // Add event code here...
  
          BindingContainer bindingsBC = BindingContext.getCurrent().getCurrentBindingsEntry();      
  
                 OperationBinding commit = bindingsBC.getOperationBinding("Commit");
                 commit.execute(); 
  
          OperationBinding operationBinding = BindingContext.getCurrent().getCurrentBindingsEntry().getOperationBinding("Commit");
          operationBinding.execute();
          DCIteratorBinding iter = (DCIteratorBinding) BindingContext.getCurrent().getCurrentBindingsEntry().get("VdetView1Iterator");// write iterator name from pageDef.
          iter.getViewObject().executeQuery();  
  
      }
  

  Thanks for all the cooperation to obtain the desired results.

  Concerning

• An update on an index column with the same value generates an index to the top

  An update on an index column with the same value generates an update of the index?
  
  
  Thank you

  In addition to my previous answer, see also

  http://orainternals.WordPress.com/2010/11/04/does-an-update-statement-modify-the-row-if-the-update-modifies-the-column-to-same-value/

  Riyaj Shamsudeen has this to say:
  "+ We have an index on this column v1 and we update this column indexed too." Oracle was updating the indexed column? N ° if the values match the level of the indexed column, then the code of RDBMS isn't up-to-date index, a feature for optimization again. Only the row of table is updated, and the index is not updated. + "

  Hemant K Collette

• How can I add a column with my favorites for my screen?

  I just started using Firefox now and can not find a way to add a column on the left side of my window in Firefox (which I didn't in Internet Explorer) showing all the links to my favorite site. In which case it is important, I use Window XP as my operating system).

  To show your Firefox Bookmarks Sidebar ("Favorites" are in IE, not Firefox), use CTRL + B to open or close the sidebar. If the bookmarks bar is open when you exit Firefox (Firefox button > exit or file > exit), it should be open when you restart Firefox.

  • You can also use the following to open or close the bookmarks bar
    • Press ALT or F10 to temporarily show the Menu bar, click View > sidebar > bookmarks to check/uncheck it (checked = displayed; United Nations-checked = not displayed
    • Hold down the ALT key while pressing the VEB keyboard letters

  If this answer solved your problem, please click 'Solved It' next to this response when connected to the forum.

  Not related to your question, but...

  You may need to update some plug-ins. Check your plug-ins and update if necessary:

  • Plugin check-> http://www.mozilla.org/en-US/plugincheck/
  • Adobe Shockwave for Director Netscape plug-in: install (or update) the Shockwave with Firefox plugin
  • Adobe PDF plug-in for Firefox and Netscape: Installation/update Adobe Reader in Firefox
  • Shockwave Flash (Adobe Flash or Flash): updated Flash in Firefox
  • Next generation Java plug-in for the Mozilla browser: install or update Java in Firefox

• can update you a table with a column field with a default value

  I'm looking at a table (table_one) developer and basically, there a column field called is_update and the default value for this field is 1.
  
  I was wondering if it would be possible for me to use a syntax of the form update
  

  update table_one t
  set t.is_update = 0;
  where t.id = 221;

  because I tried to do and the update does not work

  Semicolon (;) is the problem!

  update table_one t
  set t.is_update = 0 --Removed semicolon here!.
  where t.id = 221;
  

  http://download.Oracle.com/docs/CD/E11882_01/server.112/e17118/statements_10008.htm#SQLRF01708

  added query & URL: Johan on October 21, 2010 07:02

• Pump diagram remapping of data with the default value of sequence (12 c feature)

  Hello

  in the 12 c Oracle database there is a new feature that allows you to set default values directly from a sequence:

  http://docs.Oracle.com/database/121/NEWFT/chapter12101.htm#NEWFT155

  This helps us to save the use of triggers to get the next value of an ID column for example the DDL of such a table might look something like this:

  CREATE TABLE "FOO"."MY_TABLE" ("ID" NUMBER(10,0) DEFAULT "FOO"."MY_TABLE_ID"."NEXTVAL", ...   );

  During the pattern FOO with Data Pump export and import the schema with the remap_schema option in the BAR diagram for example, mapping works fine for all the tables, triggers, etc. except those defaults (as Oracle always writes the schema information in these default values).

  The error in the output log that says 'FOO. MY_TABLE_ID"sequence is unknown, because the sequence is now called 'BAR. MY_TABLE_ID' - mapping so does not work for default values.

  Someone knows how to fix this?

  Thanks in advance

  Concerning

  Hello

  Read this note, I think that it is an expected behavior:

  http://docs.Oracle.com/CD/E11882_01/server.112/e22490/dp_import.htm#SUTIL927

  REMAP_SCHEMA

  .

  Restrictions

  * The mapping cannot be 100 percent complete because there are some references to diagrams that importing is not able to find. For example, import will not find of references to patterns incorporated into the body of the definitions of triggers, types, views, procedures and packages.  -I think in your case it is the default value.

  * If any table in the schema are remapped contains object types defined by the user and this table changes between the time wherever it is exported and the time you are trying to import, and then import this table will fail. However, the import operation will continue.

  HTH,

  Pradeep

• The research of a column with comma separated values with ora-text

  I use the Oracle 11 g 2 XE and Oracle Text to a web search engine.
  
  I've now created and text indexed a CLOB keywords column that contains words separated by spaces. This allowed me to expand the search, as Oracle Text returns the rows that have one or more keywords that are stored in this column. The contents of the column are visible to the user and serves to 'expand' the search. This does not work as expected.
  
  But now I need support several words or even sentences. With the current configuration, Oracle Text will only search for each keyword. How should I store the phrases and configure Oracle text so that it will search entire sentences (exact match is better, but the partial match is fine too)?
  
  Example of content column of two lines (values separated semicolon):
  "Hello, Hello; y at - it anyone out there? Nope; »
  "the just; basic facts; »
  I found a similar question: looking for a column with values separated by commas, except that I need a solution for Oracle 11 g with it's freetext search.
  
  Possible solutions:
  1st solution: I thought to redraw the DB as follows. I would like to make a new array of keywords (pkID NUMBER, nonUniqueID NUMBER, singlePhrase VARCHAR2 (100 BYTE)). And I want to change the column previous keyword to KeywordNonUniqueID, holding the ID (instead of a list of values). At the time of the research I had INNER JOIN with the new keyword table. The problem with this solution is that I will get several lines containing the same data except for the sentence. I guess this will destroy the ranking?
  
  2nd solution: is it possible to store sentences as an XML in the column key of origin and somehow say Oracle text to search for in the XML?
  
  3rd solution: separate individual phrases with spaces, but replace the spaces in sentences with the underscore or something (making a single word). If a phrase "why Hello there, Johnny!" is saved as "Why_hello_there, _Johnny!
  
  4th solution?:
  
  Note that, generally, there is a lot of sentences (less than 100), nor that they will be long (one sentence will be up to 5 words).
  
  Also note that I am currently using CONTAINS, and needs some of its operators, to my full-text searches.

  When you talk about "phrase", do you mean "a list of words separated by a comma other sentences?

  Isn't that the definition of "sentence" used by Oracle Text, where it simply means "a list of words in the order defined."

  If I understand your requirement, you want to have data such as:

  "aa bb cc dd".
  "aa ee dd ff.

  and give priority to the first on the second if someone looking for "dd".

  First, to conduct research in the comma separated list, you should look for in a section. You can either explicitly define sections of field such as
  AA bb cc dd
  Or you can use the PHRASE special section and set the sentence delimiters correctly. This is done with the attribute BASIC_LEXER punctuation

  Then you have the number you want to find only words where they are the only words in the section. That's the same problem, I address in the last post of this forum entry:
  Contains: match exactly

  Our solution will be substantially the same, some surrounding text with special markers, and then prioritize a phrase search with these special markers each side of the word.
  We need to do a treatment some additional, although, as we need to surround each "sentence" (in your terminology) with special markers. I did it by surrounding the text with "XX1"... Condition2"then by replacing every comma with"Condition2, XX1"as part of a MULTI_COLUMN_DATASTORE:

  drop table names;
  create table names (id number primary key, text varchar2(50));
  
  insert into names values( 1, 'just and kind, kind and loving' );
  insert into names values( 2, 'just, kind' );
  
  exec ctx_ddl.drop_preference  ( 'mylex' )
  exec ctx_ddl.create_preference( 'mylex', 'BASIC_LEXER' )
  exec ctx_ddl.set_attribute    ( 'mylex', 'PUNCTUATIONS', ',' )
  
  exec ctx_ddl.drop_preference  ( 'mcds' )
  exec ctx_ddl.create_preference( 'mcds',  'MULTI_COLUMN_DATASTORE' )
  exec ctx_ddl.set_attribute    ( 'mcds', 'COLUMNS', '''XX1 ''||replace(text, '','',''XX2, XX1'')||'' XX2''' )
  
  exec ctx_ddl.drop_preference  ( 'mywl' )
  exec ctx_ddl.create_preference( 'mywl', 'BASIC_WORDLIST' )
  exec ctx_ddl.set_attribute    ( 'mywl', 'SUBSTRING_INDEX', 'YES' )
  
  create index namesindex on names(text)
  indextype is ctxsys.context
  parameters( 'datastore mcds wordlist mywl' )
  /
  
  select score(1),id,text from names where contains( text, '
  
    
      
         XX1 kind XX2 
         kind
      
    
  
  ', 1) > 0
  order by score(1) desc
  /
  

  Output of this is:

    SCORE(1)        ID TEXT
  ---------- ---------- --------------------------------------------------
       52         2 just, kind
        2         1 just and kind, kind and loving
  

• Find columns with only NULL values

  I have a list of tables around 30 in number. Among them i need to generate a report with Table Name and Column Names, for which all values are NULL.
  In other words, i need to find all the columns for which all the values are NULL.
  
  
  I thought of dealing it with cursors, and comparing the total count with null count in each column. But i need to loop "Number of columns" times. Is there any better way to do this?

  If your statistics are up to date, you can use the datadictionary:

  select tab.table_name
  ,      tab.num_rows
  ,      col.column_name
  ,      case
           when tab.num_rows = col.num_nulls then '*100% NULL*'
           else to_char(col.num_nulls)
         end num_nulls
  from   user_tab_columns col
  ,      user_tables tab
  where  col.table_name = tab.table_name
  and    tab.num_rows > 0
  and    tab.table_name IN (YOUR_TABLE NAMES)
  order by tab.table_name, column_id;
  

  Set the query for your needs.

• How can I replace the value of the column with a particular value in SQL

  Hi all
  
  Is someone can you please tell me how can I format my output with the replacement of a column value with a specific value that really depends on the current value of the column
  
  I am executing the following SQL statement
  
  Select state, count (id) from < table_name > where composite_dn = < composite_dn_name > Group by State;
  My current performance is:
  
  State Instance number
  1 3
  3 28
  
  I want to replace the value in the State column as follows
  
  No.OfInstances State
  3 filled
  28 faulted
  
  I want '1' to be reppaced of 'Done' and '3' is replaced by 'Faulted. '
  
  Is is possible with SQL or PL/SQL, if it is then how I can achieve this required. Help, please!
  
  Thanks in advance!
  
  Published by: Roshni Shankar on October 27, 2012 12:38 AM

  Hi Claude,.

  I guess this CASE clause can be simulated by a DECODE and also it is very easy to use.
  See - http://www.techonthenet.com/oracle/functions/decode.php

  select decode(t1.state,t2.state_id,t2.state_name), t1.count_id
  from  t2, (select state,count(id) count_id
   from 
   where composite_dn= 
  group by state) t1
  where t1.state = t2.state_id;
  

  HTH
  Vanessa B.

  Published by: Vanessa B on October 27, 2012 14:02
  -link added

  Published by: Vanessa B on October 27, 2012 14:19
  -added code sample

• problem with the default value of the parameter in function

  Hi all

  create or replace FUNCTION date_post_message (
  user_lock_in  IN  users.user_lock%TYPE,
  form_type_in  IN users.form_type%TYPE DEFAULT 0 ,
  date_in       IN                       DATE)
  RETURN BOOLEAN
  IS
  v_num number(1);
  BEGIN
  IF user_lock_in = 1 THEN
     RETURN FALSE;
  END IF;
  IF form_type_in NOT IN (1,2) THEN
     RETURN FALSE;
  END IF;
    SELECT 1
    INTO v_num
    FROM changes
    WHERE date_post_msg <= date_in ;
    RETURN TRUE;
  exception
  WHEN NO_DATA_FOUND THEN
  RETURN FALSE;
  END date_to_post_msg;

  problem: there is null, the function ignore the form_type_in default value 0.
  Why? the default value is valid only in the parameter of the procedure?
  Thanks to Advnaced
  Naama

  Naama wrote:
  If a value is null to convert it to 0? I mean in the part of the statement of the parameter

  No, can't do this in the signature. You will need to manage this by validating the parameters passed at the beginning of the function.

  It is quite simple. In your case, you might as well test for NULL and fail to function like this:

      FUNCTION date_post_message(
              user_lock_in IN NUMBER,
              form_type_in IN NUMBER DEFAULT 0 ,
              date_in      IN DATE)
          RETURN BOOLEAN
      IS
          v_num NUMBER(1);
      BEGIN
          dbms_output.put_line('Value of parameters : user_lock_in : '||user_lock_in || ' : form_type_in : '||form_type_in||' : date_in : '||date_in );
          IF user_lock_in = 1 THEN
              RETURN FALSE;
          END IF;
          IF form_type_in IS NULL THEN
              RETURN FALSE;
          ELSIF form_type_in NOT IN (1,2) THEN
              RETURN FALSE;
          END IF;
          RETURN TRUE;
      EXCEPTION
      WHEN NO_DATA_FOUND THEN
          RETURN FALSE;
      END;
  

  In other cases of use I would issue a local variable and treat it like this:

          IF form_type_in IS NULL THEN
              l_form_type := 0;
          ELSE
               l_form_type := form_type_in;
          END IF;
  

  Of course, the code should use the local variable rather than the parameter.

  It is a good practice to validate values passed in parameters at the beginning of a function. If you really want to go to the city, discover the Design By Contract.

  Cheers, APC

  Published by: APC on November 9, 2011 13:36

  Example added, as requested by OP

• Update a column with randomly selected values

  Hello

  We have a chart of accounts that represents mainly the brands & channels. an example is shown below.

  account_ID chain_id brand_id service

  1 11 NULL NULL

  1 12 NULL NULL

  2 11 NULL NULL

  Here, I want to update the chain_id & brand_id which are currently ZERO in order to make all the eligible ranks for further processing. There is another table (say chain_brand) that maintains the relationship between chain_id and brand_id. a chain_id can have several brand_ids

  for example, chain_id brand_id

  101 2011

  101 2012

  102 2020

  Now I need a script that could randomly choose the values in the chain_brand table, and update the table accountable. condition is that these values must be unique for an argument account_id

  EG.,.

  account_ID chain_id brand_id service

  1 101 2011 11

  1 101 2011 12

  2 102 2020 11

  so each account can be attached to a single chain_id and a brand_id.

  Please suggest how this can be achieved.

  TIA.

  There is probably a pure sql solution far superior to mine... but in pl/sql

  Start

  for c in (select account_id, separate accounts)

  loop

  Update accounts

  package (chain_id, brand_id) = (select chain_id, brand_id

  from (select *)

  of chain_brands

  order of dbms_random.value)

  where rownum = 1)

  where account_id = c.account_id;

  end loop;

  end;

• prompt of dashboard works do not correctly with the default values

  I created 2 dashboard:
  
  Dashboard 1 are:
  prompt A
  report A
  
  Dashboard 2 were:
  B invites
  report B
  
  Report A and B are the same reports as structure and filters. Only have different names.
  Prompt A and B both filtered region attributes:
  Invite a default view in clause sql on the "Région" attribute values: region1, 2, 3
  B quickly view sql clause on the "Région" attribute default values: 4, 5, 6
  
  If I run the A dashboard, it works fine.
  If I run the dashboard B, show me the same values of the dashboard (region1, 2, 3) in the two guests of report.
  If I click on the Clear button, the B dasbhoard runs correctly and shows 4, 5, 6 in the two guests of report.
  
  Seems to be something in the cache. But why?
  
  
  Sara
  
  Published by: Sara C. on 18 / gen/2010 9.41

  Go ahead and skip this step then. I never did, but my colleague has mentioned that you can disable the RPD to be cached at all, so if you are in online mode and you still cannot manage the cache, assume that this feature is disabled.

  In addition, as I said above, I don't think it is a caching problem, it was just more precautionary, so I don't think it will be a big problem.

  Please let me know how the rest goes!

  Kind regards
  Jason

  PS - Out of curiosity, what version of OBIEE do you use? 10.1.3.4?

• Column with the default (to_date()) - failure on SQL Developer

  Hello

  I will you run the following statement:

  ALTER TABLE PERIOD
  ADD
  (
  PP_START_DATE DATE default to_date ('19000101', 'YYYYMMDD') NOT NULL,
  PP_END_DATE DATE default to_date ('19000101', 'YYYYMMDD') NOT NULL
  );

  This works very well and as planned. Existing entries in the table will win by default - that day.

  Now, when I open SQL Developer and go on the columns tab and then click on the small button edit below that an editor window opens showing me all the columns and their specifications.
  Here, I am able to modify change data. I notice that, in the columns of default_value for my two new columns, the value is ' to_date ('19000101', 'YYYYMMDD').

  Well I wonder about this but can SQL Developer, due to the use of a function, knows not what is calculated it and it can depends on somtething like Sysdate so that the SQL Developer must keep this dynamic statement.
  -> Ok so far.
  But when I (no matter if I change something or not) not to click OK, I get an error as follows:

  =========================================================
  Column validation failure
  ---------------------------------------------------------
  Invalid expression ' to_date ('19000101', 'YYYYMMDD').
  DATE or TIMESTAMP expression expected.
  =========================================================

  The question I have is: why is a failure and can do I do something wrong?
  I can still edit the table using SQL, so this isn't the problem. But I wonder if it's an allusion to a bigger mistake.
  If possible: is there a way to get SQL Developer working with it without losing the default dynamic value?

  Thanks for the replies.

  This seems to be the same "not a bug" that has been reported here a few days ago:

  https://community.Oracle.com/thread/3517090